Carrier Service - how to return a 'no rate' rate?

Shopify Partner
99 8 32

For my carrier service, in the event that no rate is available for a purchase, how should the return rate values be shaped? Returning null values just prompts the user to complete the already completed address details, but what I want to invoke is the 'can't ship to you' rate. There's no docs I can find to explain this.

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